So just to expand on this;
I just got off the phone with Superlift a few minutes ago and the story I was told, is that Some of the companies that manufactured the individual components (The Electronic Geometry Recalibration module was specifically mentioned - possibly something to do with the Computer Chip Shortage I keep hearing about) supposedly quadrupled their prices, virtually overnight and they would not work with Superlift to give them a more manageable cost for ordering in bulk;
The end result was the cost of the 4 inch Superlift for the WK & the XK became prohibitive, to the point where they were no longer profitable.
I asked if I had a component go bad, would I be able to get any replacement parts through them & he said essentially, the only parts they would probably still have in stock would be the rear shocks, which really doesn't matter - you could replace those shocks with any other shocks that had the correct specs.
The bottom line is for anybody out there like me that has the 4 inch Superlift installed is, if you have a catastrophic failure of any major component - or , if you're Superlift has a lot of miles on it and you want to freshen it up, you will probably wind-up going to a different lift kit, or just mixing & matching individual components of different manufacturers, to achieve the best end result you can come up with.
Superlift can no longer give us any kind of real support, for the 4 inch Superlift.